Prattle about student being more plausible (7)

I believe the answer is:

glibber

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'more plausible' is the definition.
('glib' can be similar in meaning to 'plausible')

'prattle about student being' is the wordplay.
'prattle' becomes 'gibber' (synonyms).
'about' is an insertion indicator.
'student being' becomes 'l' (I am not sure about this - if you are sure you should believe this answer much more).
'gibber' enclosing 'l' is 'GLIBBER'.

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I've seen this clue in The Daily Express.

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